New rear bumper for Rooies.
- niclemaitre
- LR 4WD Full Lockers
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- Town: Stellenbosch
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- Real Name: Nic
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New rear bumper for Rooies.
The 30 year old stock rear bumper on Rooies was very tired and rusty. It also had no way to use it for recoveries. I was beginning to become worried that a trailer might break the hitch point off. So it was time for a new one.
With some input from my engineering mates I designed a new one that has recover points, is directly inline with the chassis rails and looks somewhat stock.
Stress caluculations 10mm plate laser cut by TFD in Strand.
With some input from my engineering mates I designed a new one that has recover points, is directly inline with the chassis rails and looks somewhat stock.
Stress caluculations 10mm plate laser cut by TFD in Strand.
Happy trails
Nic
SFA '97 DC - affirmatively shopped
SFA '87 DC "Rooies" - sold
IFS '99 DC "Benny"
Nic
SFA '97 DC - affirmatively shopped
SFA '87 DC "Rooies" - sold
IFS '99 DC "Benny"
- niclemaitre
- LR 4WD Full Lockers
- Posts: 933
- Joined: Mon Jun 13, 2011 2:44 pm
- Town: Stellenbosch
- Vehicle: 99 IFS DC 4x4
- Real Name: Nic
- Location: Stellenbosch
Re: New rear bumper for Rooies.
Cut the holes in the rear valance and test fitted the new brackets.
Test fitting and tacking the tubes. Going to need to move the number plate...
Also got some 3x38x76mm channel to add support inside the chassis rails.Happy trails
Nic
SFA '97 DC - affirmatively shopped
SFA '87 DC "Rooies" - sold
IFS '99 DC "Benny"
Nic
SFA '97 DC - affirmatively shopped
SFA '87 DC "Rooies" - sold
IFS '99 DC "Benny"
- niclemaitre
- LR 4WD Full Lockers
- Posts: 933
- Joined: Mon Jun 13, 2011 2:44 pm
- Town: Stellenbosch
- Vehicle: 99 IFS DC 4x4
- Real Name: Nic
- Location: Stellenbosch
Re: New rear bumper for Rooies.
And done.
Happy trails
Nic
SFA '97 DC - affirmatively shopped
SFA '87 DC "Rooies" - sold
IFS '99 DC "Benny"
Nic
SFA '97 DC - affirmatively shopped
SFA '87 DC "Rooies" - sold
IFS '99 DC "Benny"
- coetzer94
- Low Range 4WD
- Posts: 228
- Joined: Tue Nov 18, 2014 9:13 pm
- Town: Pretoorsdorp
- Vehicle: Silver Hilux DC 2.8 GD-6 2016
- Real Name: Vian
Re: New rear bumper for Rooies.
Looking good!!
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Working on my bucket list only makes it longer
Working on my bucket list only makes it longer
- coetzer94
- Low Range 4WD
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- Real Name: Vian
Re: New rear bumper for Rooies.
What load did you apply for the stress analysis?
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Working on my bucket list only makes it longer
Working on my bucket list only makes it longer
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Re: New rear bumper for Rooies.
Very neat. How are the pipes attached to the brackets?
- niclemaitre
- LR 4WD Full Lockers
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- Joined: Mon Jun 13, 2011 2:44 pm
- Town: Stellenbosch
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- Real Name: Nic
- Location: Stellenbosch
Re: New rear bumper for Rooies.
I don't know what load was applied for the stress analysis, I can find out it you want though.
The pipes were (badly) fillet welded to the tubes. I suck at fillet welds, but I can use a grinder
The pipes were (badly) fillet welded to the tubes. I suck at fillet welds, but I can use a grinder
Happy trails
Nic
SFA '97 DC - affirmatively shopped
SFA '87 DC "Rooies" - sold
IFS '99 DC "Benny"
Nic
SFA '97 DC - affirmatively shopped
SFA '87 DC "Rooies" - sold
IFS '99 DC "Benny"
-
- LR4WD, Lockers, Crawler Gears
- Posts: 1484
- Joined: Mon May 07, 2012 12:33 pm
- Town: Pretoria
- Vehicle: Toyota Hilux Dakar 2.8 GD-6 DC 4X4
- Real Name: Marnus
- Location: Pretoria Oos
- Contact:
Re: New rear bumper for Rooies.
You know what they say. "If you need to grind your welds then your'e a grinder not a welder!"
Still looks good though.
- coetzer94
- Low Range 4WD
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- Joined: Tue Nov 18, 2014 9:13 pm
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Re: New rear bumper for Rooies.
It would be a interesting discussion topic: Do these recovery holes take into account the load of the vehicle as well as the forces experienced during a recovery?
Lets say for a recovery the forces are 3x the weight of the vehicle (sucking thumb here) and add to that a safety factor of 2?
Your calcs should look something like this:
Vehicle 2000kg
Dynamic weight during a recovery: (x3) 6000kg
Safety factor of 2: 12 000kg
you can halve that value if you recover from 2 point at once, but for peace of mind i would analyse them for the total load on a single point.
I'm not sure about any of these numbers, but its just to get the conversation started?
Lets say for a recovery the forces are 3x the weight of the vehicle (sucking thumb here) and add to that a safety factor of 2?
Your calcs should look something like this:
Vehicle 2000kg
Dynamic weight during a recovery: (x3) 6000kg
Safety factor of 2: 12 000kg
you can halve that value if you recover from 2 point at once, but for peace of mind i would analyse them for the total load on a single point.
I'm not sure about any of these numbers, but its just to get the conversation started?
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Working on my bucket list only makes it longer
Working on my bucket list only makes it longer
- niclemaitre
- LR 4WD Full Lockers
- Posts: 933
- Joined: Mon Jun 13, 2011 2:44 pm
- Town: Stellenbosch
- Vehicle: 99 IFS DC 4x4
- Real Name: Nic
- Location: Stellenbosch
Re: New rear bumper for Rooies.
You're not actually moving the weight of the vehicle, you're overcoming the friction between the surface and the vehicle, so it's a bit more complicated than that.
Anyway, these are mounted far more securely than the old one was. The bumper itself is attached to the channel and chassis rail with two M12 grade 8.8 bolts (normal recovery points are two M10 bolts). The channel is attached to the chassis rail with one M14 8.8 bolt right through the top and bottom of the chassis rail and another M10 8.8 bolt through the top of the chassis rail.
Anyway, these are mounted far more securely than the old one was. The bumper itself is attached to the channel and chassis rail with two M12 grade 8.8 bolts (normal recovery points are two M10 bolts). The channel is attached to the chassis rail with one M14 8.8 bolt right through the top and bottom of the chassis rail and another M10 8.8 bolt through the top of the chassis rail.
Happy trails
Nic
SFA '97 DC - affirmatively shopped
SFA '87 DC "Rooies" - sold
IFS '99 DC "Benny"
Nic
SFA '97 DC - affirmatively shopped
SFA '87 DC "Rooies" - sold
IFS '99 DC "Benny"